I would like to propose a badge given to a user, when he/she has gained a cumulative number of favorites on their questions.
I believe there should be several versions of the badge i.e. bronze, silver and gold and I would suggest the names Sheriff (first favourite), Superstar (50 favourites) and Galaxy (200 stars). Maybe those values need to be tweaked as maybe these limits are too easy to achieve. As a user may favourite his/her own question I believe such stars should not count for these badges.
I am making this proposal as I feel that having a lot of your questions favorited by someone means (in my opinion) that your contributions are "exceptionally" helpful and definitely deserve some more bonuses that the current Stellar Question and Favorite Question badges.